Bose-Einstein condensation of quasi-two-dimensional frustrated quantum magnet (CuCl)LaNb2O7

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  • Kitada Atsushi
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Hiroi Zenji
    Institute for Solid State Physics, University of Tokyo
  • Tsujimoto Yoshihiro
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Kitano Taro
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Kageyama Hiroshi
    Department of Chemistry, Graduate School of Science, Kyoto University
  • Ajiro Yoshitami
    Department of Chemistry, Graduate School of Science, Kyoto University CREST, Japan Science and Technology Agency (JST)
  • Yoshimura Kazuyoshi
    Department of Chemistry, Graduate School of Science, Kyoto University

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  • Bose–Einstein Condensation of Quasi-Two-Dimensional Frustrated Quantum Magnet (CuCl)LaNb<SUB>2</SUB>O<SUB>7</SUB>

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A quasi-two-dimensional S=1⁄2 Heisenberg square-lattice antiferromagnet (CuCl)LaNb2O7 is studied by specific heat and magnetic susceptibility measurements in external fields up to 14 T. The experimental results in low fields verify the absence of the order–disorder transition, as reported previously. By further application of magnetic fields, we obtain direct evidence for the phase transition, which can be interpreted as the Bose–Einstein condensation (BEC) of magnons. However, the critical field of 10 T significantly deviates from that estimated from the zero-field gap, indicating that, unlike known experimental examples, the one-magnon mode is not a primary source to drive the BEC.

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